CN111485947A - Method for quickly closing goaf by roof cutting, pressure relief and gob-side entry retaining - Google Patents
Method for quickly closing goaf by roof cutting, pressure relief and gob-side entry retaining Download PDFInfo
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- CN111485947A CN111485947A CN202010242158.5A CN202010242158A CN111485947A CN 111485947 A CN111485947 A CN 111485947A CN 202010242158 A CN202010242158 A CN 202010242158A CN 111485947 A CN111485947 A CN 111485947A
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- gob
- single hydraulic
- goaf
- side entry
- filling
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- 238000000034 method Methods 0.000 title claims abstract description 28
- 238000005520 cutting process Methods 0.000 title claims abstract description 27
- 239000002023 wood Substances 0.000 claims abstract description 24
- 230000003014 reinforcing effect Effects 0.000 claims abstract description 22
- 239000000463 material Substances 0.000 claims abstract description 19
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 11
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 16
- 238000007789 sealing Methods 0.000 claims description 14
- 229910001294 Reinforcing steel Inorganic materials 0.000 claims description 8
- 229910052742 iron Inorganic materials 0.000 claims description 8
- 239000000178 monomer Substances 0.000 claims description 5
- 238000010276 construction Methods 0.000 abstract description 7
- 230000000694 effects Effects 0.000 abstract description 7
- 229910000831 Steel Inorganic materials 0.000 description 14
- 239000010959 steel Substances 0.000 description 14
- 239000003245 coal Substances 0.000 description 6
- 238000010586 diagram Methods 0.000 description 6
- 239000004744 fabric Substances 0.000 description 5
- 230000009286 beneficial effect Effects 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 238000005507 spraying Methods 0.000 description 3
- 230000003203 everyday effect Effects 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000005065 mining Methods 0.000 description 2
- 230000002265 prevention Effects 0.000 description 2
- 230000000717 retained effect Effects 0.000 description 2
- 239000010878 waste rock Substances 0.000 description 2
- 230000004075 alteration Effects 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000015271 coagulation Effects 0.000 description 1
- 238000005345 coagulation Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
- 238000007711 solidification Methods 0.000 description 1
- 230000008023 solidification Effects 0.000 description 1
- 230000002269 spontaneous effect Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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Classifications
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21F—SAFETY DEVICES, TRANSPORT, FILLING-UP, RESCUE, VENTILATION, OR DRAINING IN OR OF MINES OR TUNNELS
- E21F17/00—Methods or devices for use in mines or tunnels, not covered elsewhere
- E21F17/103—Dams, e.g. for ventilation
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- Engineering & Computer Science (AREA)
- Mining & Mineral Resources (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Geology (AREA)
- Devices Affording Protection Of Roads Or Walls For Sound Insulation (AREA)
Abstract
The invention provides a method for quickly closing a goaf by roof cutting, pressure relief and gob-side entry retaining, which comprises the following steps of firstly, at a working face, driving a plurality of wood point pillars along the length direction on the goaf side, and supporting a plurality of main single hydraulic pillars along the length direction on the gob-side entry; then, erecting a reinforcing mesh between the wood point column and the main single hydraulic prop, arranging a filling bag, and then pouring high-water filling materials into the filling bag until the top of the filling bag is connected; and (5) after standing for a set time, finally removing the main single hydraulic column and the side single hydraulic support. The invention can close following the working face, and the gangue stopping support and the closed goaf construction are carried out simultaneously, thereby having good closing effect, large bearing capacity and simple process.
Description
Technical Field
The invention belongs to the technical field of goaf sealing, and particularly relates to a method for quickly sealing a goaf along a gob-side entry by roof cutting and pressure relief.
Background
The top cutting pressure relief gob-side entry retaining technology includes the steps of cutting a slot through a top plate in a directional pre-splitting mode, arranging a constant-resistance anchor rope in a gob-side entry for reinforcing support, arranging a single hydraulic prop for temporarily reinforcing support, forming a gangue retaining support by a reinforcing mesh, air duct cloth, U-shaped steel and the single hydraulic prop, and finally spraying high-molecular plugging materials to seal a gob-side entry, so that the coal-pillar-free self-entry is finally realized. The directional pre-splitting cutting seam of the top plate can cut off the stress propagation of the top plate of the goaf and the top plate of the roadway, weaken the dynamic pressure influence of the movement of the top plate of the goaf on the roadway, and are very beneficial to the maintenance of the retained roadway, so that the roof cutting pressure relief gob-side entry retaining technology is widely applied to the field. In the field construction process of the roof cutting pressure relief gob-side entry retaining technology, however, the distance between the rear of a working face and the working face is required to be 100-200 m, and after the collapse of a goaf top plate is basically stable, a high-molecular plugging material can be sprayed to the gangue retaining support side to seal the goaf; when the roadway later stage and roadway reuse are influenced by secondary mining, the high-molecular plugging material needs to be re-sprayed to seal the goaf.
Therefore, the above manner of roof cutting pressure relief gob-side entry retaining closed gob has the following disadvantages: 1) the sealing goaf can not be pushed along with the working face, so that the gas in the goaf is easily over-limited in a roadway due to the fact that the gas in the goaf is poured into the roadway for a high-gas coal seam, and the left coal is easily self-ignited due to the fact that the gas in the roadway is poured into the goaf for a self-burning coal seam, so that the safety production of a coal mine is not facilitated; 2) the waste rock retaining support and the closed goaf construction are carried out step by step, multiple times of re-spraying are needed to ensure the sealing of the goaf, and the process is complex; 3) the macromolecular plugging material sprayed at the gangue retaining and supporting side has small bearing capacity, is easy to generate cracks under the action of mine pressure to carry out re-spraying, and is not beneficial to gas and fire prevention and extinguishing management; 4) the highest reaction temperature of the sprayed high molecular plugging material can reach 50 ℃, and the temperature is too high, so that the high molecular plugging material is not beneficial to gas and fire prevention and extinguishing management. Therefore, the method for quickly and effectively cutting the roof and releasing the pressure of the closed goaf is researched, and the method has important significance for improving the roof cutting and releasing gob-side entry retaining process, improving the effect of the closed goaf and improving the safety production environment of a coal mine.
Disclosure of Invention
The invention aims to provide a method for quickly sealing a gob by roof cutting, pressure relief and gob-side entry retaining, which can seal along with a working face, simultaneously perform gangue blocking support and sealing gob construction, and has the advantages of good sealing effect, large bearing capacity and simple process. In order to achieve the purpose, the invention adopts the following technical scheme:
a method for quickly closing a gob by roof cutting, pressure relief and gob-side entry retaining comprises the following steps:
(1) at the working end face, a plurality of wood point columns are arranged on the side of a goaf along the length direction, and a plurality of main single hydraulic supports are arranged on the side of a goaf along the length direction;
(2) a reinforcing mesh is erected in a filling space defined by the wood point columns and the main single hydraulic prop, and a part except one side is reserved for people to enter and exit; firmly tying the joints of the adjacent reinforcing steel bar meshes by using iron wires; hanging the filling bag on a top plate of the filling space, arranging the filling bag, sealing the reserved side with a reinforcing mesh, and screwing down with an iron wire;
(3) a side single hydraulic prop is erected along the width direction of the empty roadway and is positioned at the outer side of the reinforcing mesh;
(4) filling high-water filling materials into the filling bags until the filling bags are connected with the top;
(5) and after standing for a set time, removing the main single hydraulic prop and the side single hydraulic prop.
Preferably, in step (1), all the wood point columns are located on the same straight line; the distance between the adjacent wood point columns is 800 mm.
Preferably, in step (1), all the main individual hydraulic props are located on the same straight line; the distance between the adjacent main single hydraulic supports is 800 mm.
Preferably, in the step (1), the wood point columns and the main single hydraulic props are arranged in a staggered mode; the vertical distance between the wood point column and the main single hydraulic prop is 300 mm-500 mm.
Preferably, in the step (1), a plurality of auxiliary single hydraulic props are also supported in the gob-side entry; the distance between one auxiliary single hydraulic prop and the main single hydraulic prop is 500 mm; the distance between the hydraulic pressure of one auxiliary monomer and the secondary stoping wall is 500 mm.
Preferably, in step (2), all the reinforcing steel bar nets enclose a rectangular parallelepiped structure.
Preferably, the length of the filled bag in step (2) is determined in accordance with the speed of advancement of the work surface.
Preferably, in step (3), the number of the by-cell hydraulic props is 2.
Preferably, in step (5), the set time is 2 h.
Compared with the prior art, the invention has the advantages that:
1) the gob is sealed at the working face, namely the gob is sealed along with the working face, so that the phenomena that gas in the gob rushes into a roadway of a gob and air in the gob enters the gob are avoided, and the gob-side sealing device is particularly suitable for gob-side entry retaining of high-gas mines and spontaneous coal bed mines.
2) The high-water filling material does not separate water, and the coagulation body of the high-water filling material has expansion performance, so that the sealing effect is good, and secondary or repeated sealing is not needed.
3) The high-water filling material has high resistance increasing speed, the strength can reach more than 10MPa, and the supporting force is greater than that of U-shaped steel, so the roadway retaining effect is better.
4) The waste rock retaining support and the closed goaf construction are carried out simultaneously, and the construction process is simple.
Drawings
FIG. 1 is a structural diagram of a cut-top pressure-relief gob-side entry retaining gangue retaining support in the prior art;
FIG. 2 is a diagram showing a positional relationship among a gob, a gob-side entry, and a secondary stoping wall in the plan view of FIG. 1;
fig. 3 is a diagram showing the positional relationship among the double-layered reinforcing mat, the tie rods and the flanges in fig. 1;
fig. 4 is an application state diagram of a method for rapidly closing a gob by roof cutting, pressure relief and gob-side entry retaining according to an embodiment of the present invention;
FIG. 5 is a diagram showing the positional relationship between the wood point pillar and the main single hydraulic prop in FIG. 4;
fig. 6 is a diagram showing the main hydraulic prop and the bypass hydraulic prop of fig. 4 removed.
The method comprises the following steps of 1-first reinforcing mesh, 2-air duct cloth, 3-high polymer plugging material, 4-U-shaped steel, 5-kalan, 6-pull rod, 7-wood point column, 8-reinforcing mesh, 9-high water filling material, 10-filling bag, 11-main monomer hydraulic prop, 12-auxiliary monomer hydraulic prop, 13-goaf, 14-gob-side roadway and 15-secondary stoping side.
Detailed Description
The present invention will now be described in more detail with reference to the accompanying schematic drawings, in which preferred embodiments of the invention are shown, it being understood that one skilled in the art may modify the invention herein described while still achieving the advantageous effects of the invention. Accordingly, the following description should be construed as broadly as possible to those skilled in the art and not as limiting the invention.
As shown in fig. 1 to 3, in the prior art of roof cutting, pressure relief and gob-side entry retaining, a gangue retaining support is composed of a double-layer reinforcing mesh 8 (including 2 first reinforcing meshes 1 arranged oppositely), an air duct cloth 2, U-shaped steel 4, a flange 55 and a pull rod 6. The width a of the gob-side entry 14 is 4500mm, the distance a1 between one of the auxiliary hydraulic prop 12 and the U-shaped steel 4 is 500mm, the distance a1 between one auxiliary hydraulic prop 12 close to the secondary stoping wall 15 (lower section working face) and the secondary stoping wall 15 is 500mm, the U-shaped steel 4 is arranged along the length direction of the gob-side entry 14, and the distance b1 between the U-shaped steel 4 is 500 mm.
In the prior art, with the advancement of the working face (the advancing direction is along the length direction of the gob 14, that is, the direction perpendicular to the paper surface in fig. 1), the transportation drift on the goaf 13 side is retained in a roof cutting manner and is used as the return airway of the secondary stoping side 15, and the transportation drift is supported by a double-layer steel bar net 8+ U-shaped steel 4, specifically, as shown in fig. 2, U-shaped steel 4 is erected on the outer side of the steel bar net 8 in close contact with the steel bar net 8, and a tie rod 6 is connected to the middle upper parts of two rows of U-shaped steel 4 by using a flange 5 to enhance the stability of the U-shaped steel 4. At the initial stage of gob-side entry retaining (behind the working face, within the range of 140 m-200 m along the gob-side entry), air duct cloth 2 is additionally arranged between the first reinforcing mesh bars 1, after the top plate of the gob 13 is basically stable in movement (behind the lagging working face by 200 m), high molecular plugging materials 3 are sprayed on the air duct cloth 2 and the reinforcing mesh bars 1 to seal the gob 13, and the high molecular plugging materials 3 are sprayed again to seal the gob 13 when the reuse of the gob-side entry and the entry is influenced by secondary mining. Therefore, the process for sealing the gob 13 in the prior art is complex and has poor sealing effect.
As shown in fig. 4 to 6, for the gob-side roadway 14, the gob-side 13 and the secondary stoping wall 15 in fig. 1 to 3, the method for quickly closing the gob-side 13 by roof cutting and pressure relief gob-side entry retaining provided by this embodiment can realize closing of the gob-side 13 during the construction of a gangue-retaining support by designing a gangue-retaining support following the propulsion of a working face. The method comprises the following steps (1) to (5):
(1) at the working end face, that is, the working face is pushed, a plurality of wood point columns 7 are arranged on the side of the goaf 13 along the length direction of the goaf 13, and a plurality of main single hydraulic props 11 are arranged on the side of the goaf 14 along the length direction of the goaf 14. In other embodiments than this, the location where the timber-point post 7 and the main hydraulic prop 11 are arranged to protect may be chosen to be behind the working face by a certain distance, i.e. at a certain distance from the working face.
Preferably, all the wood point posts 7 are located on the same straight line; all the main single hydraulic props 11 are positioned on the same straight line; the distance b2 between the adjacent wood point columns 7 is 800 mm; the distance b2 between the adjacent main single hydraulic supports 11 is 800 mm; the wood point columns 7 and the main single hydraulic props 11 are arranged in a staggered mode; the vertical distance between the wood point column 7 and the main single hydraulic prop 11 is 300 mm-500 mm, such as 400 mm. At this time, a row of main single hydraulic props 11 is arranged along the length direction of the gob-side entry 14, and a row of the wooden point pillars 7 is arranged near the gob-side entry 13, also in parallel with the length direction of the gob-side entry 14. The wood point column 7 is used for supporting the side of a goaf 13 of a filling space, and the single hydraulic prop is used for supporting the side of a gob-side roadway 14 of the filling space.
(2) A reinforcing mesh 8 is erected in a filling space enclosed by the wood point column 7 and the main single hydraulic prop 11, and a part except one side is reserved for people to enter and exit; the joint of the adjacent reinforcing steel bar nets 8 is firmly tied by iron wires, namely the joint of the two adjacent reinforcing steel bar nets 8 is firmly tied by iron wires every 200mm, and then the reinforcing steel bar nets 8 are tied to the main single hydraulic prop 11 by iron wires so that the reinforcing steel bar nets 8 are tightly attached to the main single hydraulic prop 11; the filling bag 10 is hung on the top plate of the filling space, the filling bag 10 is arranged, and the left side is sealed by the reinforcing mesh 8 and then screwed down by the iron wire.
Preferably, all the reinforcing mesh 8, the bottom plate of the gob-side entry 14 and the top plate of the gob-side entry 14 enclose a rectangular parallelepiped structure. Namely, the bottom plate of the gob-side entry 14 is used as the bottom surface of the cuboid, the top plate of the gob-side entry 14 is used as the top surface of the cuboid, and 4 reinforcing meshes 8 are sequentially connected to form the front, back, left and right surfaces of the cuboid (one surface is left before the filling bag 10 is suspended and is not connected).
Further, the length of the filling bag 10 is determined according to the advancing speed of the work surface. If the working face is pushed by 3m every day, the primary filling length is determined to be 3m, and the length of the filling bag is 3.3 m; if the working face is pushed by 3.6m every day, the primary filling length is determined to be 3.6m, and the length of the filling bag is 3.9 m; to accommodate variations in the speed of advancement of the work surface, two length fill bags are typically designed, i.e., two single fill lengths. The height of the filling bag 10 is 300mm higher than the height of the gob-side entry 14, and the width of the filling bag 10 is 600 mm.
(3) And a side single hydraulic prop is erected along the width direction of the empty roadway 14 and is positioned outside the reinforcing mesh 8. Preferably, the number of hydraulic props by-passing cells is 2.
(4) And (3) filling the high-water filling material 9 into the filling bag 10 until the filling bag is connected to the top, and after the filling bag is connected to the top, the filling bag 10 and the high-water filling material 9 in the filling bag form a roadside filling body together.
(5) After standing for a set time, the main single hydraulic column and the side single hydraulic prop are removed, and the reinforcing mesh 8 and the wood point column 7 at the side of the goaf 13 are not withdrawn. In the present embodiment, the set time is 2 h. The high-water filling material 9 has high resistance increasing speed, and the strength of a solidification body can reach 3MPa after 2 hours.
In this embodiment, a plurality of auxiliary single hydraulic props 12 are also supported in the gob-side entry 14; the distance a1 between one auxiliary single hydraulic prop 12 and the main single hydraulic prop 11 is 500 mm; the distance a1 between an auxiliary monomer hydraulic pressure and the secondary stoping wall 15 is 500 mm.
The above description is only a preferred embodiment of the present invention, and does not limit the present invention in any way. It will be understood by those skilled in the art that various changes, substitutions and alterations can be made herein without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (9)
1. A method for quickly closing a goaf by roof cutting, pressure relief and gob-side entry retaining is characterized by comprising the following steps:
(1) at the working end face, a plurality of wood point columns are arranged on the side of a goaf along the length direction, and a plurality of main single hydraulic supports are arranged on the side of a goaf along the length direction;
(2) a reinforcing mesh is erected in a filling space defined by the wood point columns and the main single hydraulic prop, and a part except one side is reserved for people to enter and exit; firmly tying the joints of the adjacent reinforcing steel bar meshes by using iron wires; hanging the filling bag on a top plate of the filling space, arranging the filling bag, sealing the reserved side with a reinforcing mesh, and screwing down with an iron wire;
(3) a side single hydraulic prop is erected along the width direction of the empty roadway and is positioned at the outer side of the reinforcing mesh;
(4) filling high-water filling materials into the filling bags until the filling bags are connected with the top;
(5) and after standing for a set time, removing the main single hydraulic prop and the side single hydraulic prop.
2. The roof-cutting pressure-relief gob-side entry retaining quick goaf closing method according to claim 1, characterized in that in step (1), all the wood point columns are located on the same straight line; the distance between the adjacent wood point columns is 800 mm.
3. The method for rapidly closing the goaf along the gob-side entry by roof cutting and pressure relief according to claim 2, wherein in the step (1), all the main single hydraulic props are positioned on the same straight line; the distance between the adjacent main single hydraulic supports is 800 mm.
4. The roof-cutting pressure-relief gob-side entry retaining quick goaf closing method according to claim 3, characterized in that in step (1), the wood point pillars and the main single hydraulic pillars are staggered; the vertical distance between the wood point column and the main single hydraulic prop is 300 mm-500 mm.
5. The method for rapidly closing the goaf along the gob-side entry by roof cutting and pressure relief according to claim 4, wherein in the step (1), a plurality of auxiliary single hydraulic supports are further supported in the gob-side entry; the distance between one auxiliary single hydraulic prop and the main single hydraulic prop is 500 mm; the distance between the hydraulic pressure of one auxiliary monomer and the secondary stoping wall is 500 mm.
6. The method for rapidly closing the goaf along the gob-side entry by roof cutting and pressure relief according to claim 1, wherein in the step (2), all the reinforcing steel meshes are enclosed into a rectangular parallelepiped structure.
7. The roof-cutting pressure-relief gob-side entry retaining quick gob-side closing method according to claim 1, wherein the length of the filling bag in the step (2) is determined according to the advancing speed of the working face.
8. The method for rapidly closing the goaf along the gob-side entry by roof cutting and pressure relief according to claim 1, wherein in the step (3), the number of the single hydraulic props is 2.
9. The method for rapidly closing the goaf along the goaf by roof-cutting pressure relief according to claim 1, wherein in step (5), the set time is 2 h.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010242158.5A CN111485947A (en) | 2020-03-31 | 2020-03-31 | Method for quickly closing goaf by roof cutting, pressure relief and gob-side entry retaining |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010242158.5A CN111485947A (en) | 2020-03-31 | 2020-03-31 | Method for quickly closing goaf by roof cutting, pressure relief and gob-side entry retaining |
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| CN111485947A true CN111485947A (en) | 2020-08-04 |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112112668A (en) * | 2020-09-25 | 2020-12-22 | 陕西煤业化工技术研究院有限责任公司 | Gob-side entry retaining gob gangue blocking closed structure and manufacturing method thereof |
| CN112253239A (en) * | 2020-09-17 | 2021-01-22 | 太原理工大学 | Side roadway side blocking prefabricated part of mining area for roof cutting and roadway forming of high-gas mine and using method |
| CN112483170A (en) * | 2020-11-11 | 2021-03-12 | 河南理工大学 | Filling structure for roof cutting pressure relief gob-side entry retaining and construction method thereof |
| CN112627892A (en) * | 2020-12-21 | 2021-04-09 | 中国矿业大学 | Closed wall construction method based on reinforcing mesh and high-water-content material |
| CN113175352A (en) * | 2021-06-07 | 2021-07-27 | 山东科技大学 | Foldable leakage-stopping air bag combination and preparation process thereof |
| CN114263482A (en) * | 2021-12-27 | 2022-04-01 | 安徽理工大学 | Method for blasting-free roof cutting pressure relief gob-side roadway of soft-roof coal seam |
| CN114562329A (en) * | 2022-04-02 | 2022-05-31 | 中国矿业大学 | Non-closed overlying strata grouting, filling and isolating method |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112253239A (en) * | 2020-09-17 | 2021-01-22 | 太原理工大学 | Side roadway side blocking prefabricated part of mining area for roof cutting and roadway forming of high-gas mine and using method |
| CN112112668A (en) * | 2020-09-25 | 2020-12-22 | 陕西煤业化工技术研究院有限责任公司 | Gob-side entry retaining gob gangue blocking closed structure and manufacturing method thereof |
| CN112483170A (en) * | 2020-11-11 | 2021-03-12 | 河南理工大学 | Filling structure for roof cutting pressure relief gob-side entry retaining and construction method thereof |
| CN112627892A (en) * | 2020-12-21 | 2021-04-09 | 中国矿业大学 | Closed wall construction method based on reinforcing mesh and high-water-content material |
| CN113175352A (en) * | 2021-06-07 | 2021-07-27 | 山东科技大学 | Foldable leakage-stopping air bag combination and preparation process thereof |
| CN114263482A (en) * | 2021-12-27 | 2022-04-01 | 安徽理工大学 | Method for blasting-free roof cutting pressure relief gob-side roadway of soft-roof coal seam |
| CN114263482B (en) * | 2021-12-27 | 2024-02-13 | 安徽理工大学 | Soft roof coal seam non-blasting roof-cutting pressure-relief gob-side entry method |
| CN114562329A (en) * | 2022-04-02 | 2022-05-31 | 中国矿业大学 | Non-closed overlying strata grouting, filling and isolating method |
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